^S is used by stty, use ^K

README.md

@@ -205,7 +205,7 @@ The list below is from the **dev branch**. Press <kbd>?</kbd> in `nnn` to see th
            ^O  Open with...      n  Create new/link
             D  File detail   ^R F2  Rename/duplicate
      ⎵ ^J / a  Sel entry/all     r  Batch rename
-         m ^S  Sel range, clear  M  List selection
+         m ^K  Sel range, clear  M  List selection
             P  Copy selection    X  Delete selection
             V  Move selection   ^X  Delete entry
             f  Create archive    C  Execute entry

src/nnn.c

@@ -2872,7 +2872,7 @@ static bool show_help(const char *path)
 		 "b^O  Open with...      n  Create new/link\n"
 		  "cD  File detail   ^R F2  Rename/duplicate\n"
 	   "5⎵ ^J / a  Sel entry/all     r  Batch rename\n"
-	       "9m ^S  Sel range, clear  M  List selection\n"
+	       "9m ^K  Sel range, clear  M  List selection\n"
 		  "cP  Copy selection    X  Delete selection\n"
 		  "cV  Move selection   ^X  Delete entry\n"
 		  "cf  Create archive    C  Execute entry\n"

src/nnn.h

@@ -199,7 +199,7 @@ static struct key bindings[] = {
 	{ ' ',            SEL_SEL },
 	/* Toggle select multiple files */
 	{ 'm',            SEL_SELMUL },
-	{ CONTROL('S'),   SEL_SELMUL },
+	{ CONTROL('K'),   SEL_SELMUL },
 	/* Select all files in current dir */
 	{ 'a',            SEL_SELALL },
 	/* Show list of copied files */